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Polypept(o)ide-Based Core-Shell Bottlebrush Polymers: A Versatile Platform for Drug Encapsulation.
Bonan Zhao1, Jingyuan Wei1, Rüdiger Berger2
1Leiden Academic Center for Drug Research (LACDR), Leiden University, Einsteinweg 55, Leiden, 2333CC, The Netherlands.
This study introduces novel core-shell brushes (CSBs) synthesized from polypept(o)ides, demonstrating their potential as nanomedicine platforms. These versatile nanoparticles effectively encapsulate and release the drug dasatinib, showing therapeutic efficacy in glioblastoma cells.
Area of Science:
- Polymer Chemistry
- Nanotechnology
- Materials Science
Background:
- Cylindrical bottlebrush polymers (CBPs) offer tunable nanoparticle properties via synthesis.
- Block copolymer side chains facilitate the creation of core-shell nanostructures.
Purpose of the Study:
- To synthesize polypept(o)ide-based core-shell CBPs (CSBs) using a "grafting-from" approach.
- To evaluate the potential of these CSBs as a platform for drug encapsulation and delivery.
Main Methods:
- Synthesized core-shell brushes (CSBs) with a poly-lysine (pLys) backbone and poly(γ-benzyl-l-glutamic acid)-block-polysarcosine (pGlu(OBn)-b-pSar) side chains.
- Characterized CSB size, molecular weight, and dispersity using size-exclusion chromatography.
- Investigated drug loading, release kinetics, cellular uptake, and therapeutic efficacy using dasatinib as a model drug.
Main Results:
- Successfully synthesized CSBs with tunable hydrodynamic radii (17-70 nm) and high molecular weights (1320-4000 kg mol⁻¹).
- Achieved 10% loading efficiency for dasatinib, with sustained release over 72 hours.
- Demonstrated cellular uptake into U-87 MG glioblastoma cells and drug-related therapeutic effects.
Conclusions:
- Polypept(o)ide-based CSBs represent a promising platform for nanomedicine applications.
- The developed CSBs show potential for targeted drug delivery and cancer therapy.
- Further optimization, such as covalent drug attachment, could enhance drug release profiles.
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